You can rationalize it however you want to, it’s undemocratic and it means the people do not get to choose who they vote for.
It wasn’t just 2016. They told everyone to drop just before the primary in 2020 so Biden could run, who then only won because people were motivated to get Trump out. Then in 2024 they didn’t even have a primary, ignored protest “uncommitted” votes and pretended everything including the economy was booming, and used the same exact campaign manager for Kamala that ran Hliary’s campaign into the ground. Saying they made “reforms” is just complete bullshit to make you feel like they are responsive to the will of the people, and I can’t believe anyone falls for it.
The rest of that is just more drivel, it’s simply the most successful way the Democrats have been able to justify their anti-democratic actions and rhetoric. Candidates are electable if the people vote for them and, even if it does “split the ticket” (it doesn’t), more candidates allows more competing narratives to get out there and changes what discussions are taking place across election season. When the results come back, those results tell the major parties (and the people) what motivated the people to vote, so they can meet the people where they are and be held accountable when they refuse to. If there are no progressive candidates getting a significant number of votes, they take it as a message to move right and capture that audience instead.
If the Republicans and Democrats can’t get the people off their couches, why don’t they let someone else give it a try?
Why wait for the major parties to replace the system that keeps them in power? Why shouldn’t the people vote for a third party that truly strives to represent their views? Just because the major parties say they can’t, tie things up in the courts, and make up some bullshit to justify it? Why should the people remain committed to a system that sells them out to the highest bidder and erodes their rights no matter who is in power?
How do you know a progressive third party couldn’t also sway many Republican voters just as it does Democrat voters, by revealing just how corrupt and ineffective both major parties are, teaching the people how the other parties’ answers will fail them and have failed them in the past, and making an honest effort to stand up for working class interests?